Collins, who plays the dishy angel Castiel on Supernatural, had just Found the Thing.

Ordinarily this meme plays out on Tumblr, where fans of John Green attempt to get his attention by getting him to reblog things that relate to him or his books. Since Green is on Tumblr anyway, rounds of “Make John Green Find The Thing,” as they’re known, are frequent.

But when 21-year-old Nina started her currency revolution on Tumblr, she wasn’t thinking of memes, but rather of Collins’ penchant for trolling his own fandom.

“I want to take a dollar bill and write ‘are you Misha Collins’ on it and maybe one day it’ll end up in his hands and he’d be the one mind fucked for once,” she wrote on Oct. 12, 2012. Later, she jokingly added, “The journey has begun,” as Tumblr piled on in reblogs.

But it’s doubtful she had any idea where her spontaneous meme would end a year later. Collins, who has over a million followers on Twitter, enjoys a huge fanbase who took over Tumblr earlier this year in a massive party called Mishapocalypse. They’ve also raised millions of dollars for Collins’ charity, Random Acts, and turned his annual scavenger hunt, GISHWHES, into an event that regularly breaks world records.

So given the opportunity, it was inevitable that the Misha fandom would take Nina’s suggestion and run with it.

“Are you Misha Collins?” became a Tumblr tag full of evidence of people sending the question out into the ether on the backs of $1 bills. By summer, the currency floated around like urban legends. “I have 3 dollar bills with "Are You Misha Collins?" written on them, wrote a commenter on FunnyJunk in June. “Who is Misha Collins, what 'viral' marketing campaign is this and why are they getting away with defacing currency?”

It's no secret that the Supernatural fandom is huge on Tumblr.
After all, there's a reason that the homespun, frequently homoerotic remix of mythology, religion, folklore, and Americana is now in its 8th season and ruling the WB as well as fandom. Or should we say, there are three reasons: stars Jensen Ackles, Jared Padalecki, and Misha Collins.